The Infinite Unknown

Summary

Saule Technologies is a Wroclaw, Poland-based photovoltaic technology company founded in 2015, specializing in flexible, lightweight perovskite solar modules manufactured using scalable roll-to-roll printing processes. The company develops perovskite absorber layers (likely halide perovskites, composition optimized for stability) integrated onto flexible plastic substrates (polyethylene naphthalate, PEN, or similar) via continuous printing and coating methods. This approach enables low-cost, high-throughput manufacturing of flexible solar modules suitable for building-integrated photovoltaics (BIPV), lightweight aerospace/automotive applications, IoT sensors, and emergency power systems. Saule targets commercial-scale roll-to-roll production, with modules achieving 18–22% efficiency on flexible substrates — a significant technical achievement for flexible PV.

Key Facts

• Founded: 2015
• HQ: Wroclaw, Poland
• Type: Private (venture-backed, EU funding)
• Key investors / funding: European venture capital (Climate Angels, various EU climate funds), strategic corporate partnerships; total raised estimated €30–50M
• Core technology: Flexible perovskite solar modules using roll-to-roll printing and coating on plastic substrates (PEN, PET, or similar)
• Target efficiency: 18–22% on flexible substrates (lab to pilot scale); world-record flexible perovskite efficiency is ~21–22%
• Key differentiator: Continuous roll-to-roll manufacturing process (vs. lab-scale batch processing); low-cost, high-volume capable; lightweight and flexible form factor
• Manufacturing footprint: Pilot-scale production in Poland; scaling toward commercial-scale roll-to-roll line
• Applications: Building-integrated PV (BIPV), lightweight roofing, vehicle integration, IoT sensors, emergency power systems
• Regulatory position: EU-based; benefits from European climate funding and circular economy standards

What It Is / How It Works

Flexible perovskite fundamentals: Most perovskite research uses rigid glass substrates (standard laboratory approach). Flexible perovskites require:

• Substrate material: Plastic film (PEN or PET) instead of glass; must withstand processing temperatures (~150–200°C) and maintain optical clarity
• Layer stack: All functional layers (electrode, perovskite absorber, charge transport, electrode) must be deposited onto or integrated onto plastic in a compatible manner
• Processing constraints: Lower-temperature deposition methods vs. glass-based devices; e.g., solution-based spin-coating or spray-coating at moderate temperatures instead of high-temperature vacuum deposition

Roll-to-roll manufacturing: Instead of batch processing (discrete cells on fixed substrates), Saule uses continuous roll-to-roll printing:

1. Flexible film roll: Plastic substrate (PEN, ~100–200 µm thick) unwound from a roll
2. Coating steps: Sequential coating stations deposit:
   • Transparent conductive oxide (TCO) or printed silver grid (flexible electrode)
   • Electron transport layer (compact oxide, often TiO₂)
   • Perovskite absorber (printed via blade-coating, inkjet, or slot-die methods)
   • Hole transport layer and back electrode
3. Continuous curing: UV or thermal curing between coating steps
4. Encapsulation: Edge sealing and top/bottom moisture barriers
5. Module assembly: Cut into module-size segments; integrated into flexible frames or mounting systems

Printing methods: Saule likely employs:

• Blade coating: Squeegee-like blade deposits uniform film of perovskite precursor solution
• Slot-die coating: Precise volumetric control for thin, uniform layers at high speed
• Inkjet printing: (Potential future); allows spatial control but slower throughput

Flexibility advantage: Flexible modules enable:

• Lighter weight (1–2 kg/m² vs. 12–20 kg/m² for glass modules); valuable for rooftop retrofit, portable, vehicle integration
• Conformal mounting (curved surfaces, irregular geometries)
• Roll transport and shipping (compact, low logistics cost)
• Form-factor innovation (rolls, flexible sheets) opening new markets (tents, vehicle wraps, portable power)

Notable Developments

• 2023–2025: Scaling from pilot to commercial-grade roll-to-roll production line; demonstration of durability under environmental stress testing (thermal cycling, humidity, UV); partnership announcements with BIPV integrators and OEMs
• 2021–2023: Pilot production line operational; announcement of flexible perovskite efficiency milestones (18%+, 19%+); press releases on production scale and cost trajectory
• 2018–2020: Core R&D and prototype demonstration; strategic partnerships with European universities (Technical University Wroclaw, KTH, others); EU funding (Horizon Europe or similar)
• 2015: Founded; team includes photovoltaics researchers from Polish and European institutions

Key People

Olga Malinkiewicz — Co-Founder & Chief Technology Officer

• LinkedIn: Search “Olga Malinkiewicz Saule”
• Background: Polish physicist and inventor; the scientific founder of Saule Technologies. Invented the inkjet-printing method for producing perovskite solar cells — the core IP underlying Saule’s roll-to-roll manufacturing approach. Widely recognized as a pioneer in perovskite photovoltaics and has received multiple innovation awards in Poland and internationally. Her PhD research at Valencia (Spain) led directly to the founding of the company.

Piotr Krych — Co-Founder & Chief Executive Officer

• LinkedIn: Search “Piotr Krych Saule”
• Background: Business-focused co-founder responsible for commercial strategy, investor relations, and scaling operations. Leads the company’s transition from pilot manufacturing to commercial-scale roll-to-roll production.

Artur Kupczunas — Co-Founder & Board Member

• LinkedIn: Search “Artur Kupczunas Saule”
• Background: MBA (University of Minnesota), M.Tech (Poznan University of Technology). Serial entrepreneur and venture investor; founder of Edge1S, SensDx, and NanoPure; manages the Bridge One venture capital fund. Provided early-stage capital and entrepreneurial infrastructure for Saule alongside Malinkiewicz’s technical work.

Leadership — Last Reviewed: 2026-04-03

Supply Chain Position

⚑ Printing process control: Roll-to-roll coating requires tight process control (coating speed, temperature, humidity, layer thickness uniformity) across meter-wide or wider substrates. Defect rates in early production can be high (>20%); yield improvement is a critical development lever.

⚑ Perovskite stability on plastic: The perovskite absorber layer must remain stable under thermal and moisture stress on a flexible substrate that is naturally moisture-permeable (compared to glass). Encapsulation and edge-sealing quality are critical to module lifetime; achieving 25+ year lifetime is challenging.

⚑ Substrate transparency loss: Adding multiple layers (TCO, electron transport, perovskite, hole transport) onto plastic can create haze and light scattering; maintaining high optical transparency while achieving high efficiency requires precision layer thickness and material selection.

⚡ Cost trajectory: Roll-to-roll manufacturing is capital-intensive for setup (~50–100M€ for a full-scale line) but offers dramatic per-unit cost reduction at scale (target <$0.50/W module cost vs. ~$1–2/W for glass-based perovskite). Economic viability depends on achieving high-volume (50+ MW/year) deployment; risk is demand uncertainty.

Research Relevance

Why this matters for energy research: Saule Technologies represents a critical application expansion of perovskite photovoltaics into flexible form factors and roll-to-roll manufacturing. Key research implications:

1. Manufacturing paradigm shift: Most perovskite development is lab-based (batch, rigid substrates). Roll-to-roll is a step change toward industrial-scale, continuous production — essential for cost reduction and commercial viability.

2. New application markets: Flexible perovskites enable use cases impossible with glass modules:

   • Lightweight vehicle-integrated PV (drones, vehicles, aircraft) where weight is critical
   • Portable/emergency power systems
   • Temporary installations (festivals, emergency camps)
   • Aesthetic BIPV (curved facades, flexible cladding)

3. Cost reduction pathway: Continuous manufacturing and flexible substrates reduce material and labor costs. If Saule achieves 50+ MW/year scale, it could drive perovskite cost to $0.40–0.60/W (vs. $1–2/W at low volume), making perovskites competitive with silicon in cost.

4. Encapsulation and durability challenge: Flexible perovskites will be exposed to more outdoor stress (flex cycles, thermal shock) than rigid modules. Saule’s progress on durability is a crucial bellwether for whether perovskites can meet 25–30 year warranty requirements.

5. European competitiveness: Saule is a European (Polish) company, positioning Europe as a potential hub for flexible PV manufacturing — a geopolitical diversification from silicon PV (China-dominated) and US-based perovskite/tandem research.

Claim Verification

Claim: “Flexible perovskite modules achieve 18–22% efficiency”

Status: Partially verified — lab scale confirmed; production-scale data limited

Supporting: Academic research (NREL, Fraunhofer ISE, European universities) has published flexible perovskite cell efficiencies of 18–22%; Saule likely has comparable or better proprietary results

Limiting: Module efficiency is typically 2–3 percentage points lower than cell efficiency due to series resistance, module wiring, and edge losses. Saule’s stated 18–22% likely refers to cell or small module scale; full-size module efficiency may be 16–20%.

Summary: Claim is plausible but requires clarification between cell and module efficiency; actual deployed module performance will be lower.

Claim: “Roll-to-roll manufacturing enables high-volume, low-cost production”

Status: Verified in principle; execution remains uncertain

Supporting: Roll-to-roll coating is a well-established manufacturing method in printing, flexible electronics, and thin-film PV; technical feasibility is proven

Limiting: Scaling from pilot (a few MW/year) to commercial (50+ MW/year) requires investment in full-scale manufacturing line (~50–100M€ capital cost), equipment suppliers, and supply chain partnerships. Saule’s timeline for reaching commercial scale is ambitious; delays are common in manufacturing scale-up.

Summary: The underlying manufacturing approach is sound, but commercial-scale execution is a multiyear challenge.

Sources

• Saule Technologies — sauletech.com
• Flexible Perovskite Solar Cells — NREL Research
• Roll-to-Roll Coating for Photovoltaics — Progress in Photovoltaics
• Perovskite Durability and Encapsulation — Nature Energy
• European Solar Industry Association (EPIA) Market Reports